std::iostream_category

 

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I / O操纵

C-风格的I / O

缓冲区 Original: Buffers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_streambuf

basic_filebuf

basic_stringbuf

strstreambuf （过时了）

流 Original: Streams The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

抽象 Original: Abstractions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

ios_base

basic_ios

basic_istream

basic_ostream

basic_iostream

文件I / O Original: File I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_ifstream

basic_ofstream

basic_fstream

字符串I / O Original: String I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_istringstream

basic_ostringstream

basic_stringstream

阵列的I / O Original: Array I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

istrstream （过时了）

ostrstream （过时了）

strstream （过时了）

类型 Original: Types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

streamoff

streamsize

fpos

Error类的接口 Original: Error category interface The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

iostream_category （C++11）

io_errc （C++11）

 

Defined in header <ios>
const std::error_category& iostream_category();		（C++11 起）

获得的静态iostream的错误的错误类对象的引用。需要重写虚函数error_category::name()返回一个指针，指向的字符串"iostream"的对象。它被用来确定提供的错误代码在例外的类型std::ios_base::failure.

Original:

Obtains a reference to the static error category object for iostream errors. The object is required to override the virtual function error_category::name() to return a pointer to the string "iostream". It is used to identify error codes provided in the exceptions of type std::ios_base::failure.

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参数

（无）

Original:

(none)

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返回值

未指定的运行时类型，来自std::error_category的静态对象的参考.

Original:

A reference to the static object of unspecified runtime type, derived from std::error_category.

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例外

noexcept specification:  

noexcept

  （C++11 起）

为例

#include <iostream>
#include <fstream>
 
int main()
{
    std::ifstream f("doesn't exist");
    try {
        f.exceptions(f.failbit);
    } catch (const std::ios_base::failure& e) {
        std::cout << "Caught an ios_base::failure.\n"
                  << "Error category: " << e.code().category().name() << '\n';
    }
}

Output:

Caught an ios_base::failure.
Error category: iostream

另请参阅

failure	流异常 Original: stream exception The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （公共成员类of std::ios_base）
io_errc （C++11）	IO流的错误代码 Original: the IO stream error codes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （枚举）